Bosch GLL 3-80 - Инструкция по эксплуатации - Страница 23

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23

Without the app, the cause cannot be identified, as the indic-
ator 

CAL guard

(3)

 lighting up indicates merely that the lev-

elling accuracy needs to be checked.
Once the warning has been triggered, the indicator 

CAL

guard

(3)

 lights up until the levelling accuracy has been

checked and the indicator switched off.

Procedure in the Event of a Calibration Warning Being
Triggered

Check the levelling accuracy of the measuring tool (see "Ac-
curacy Check of the Measuring Tool", page 23).
If the maximum deviation has not been exceeded in any of
the tests, switch the indicator 

CAL guard

(3)

 off. To do so,

press and hold the receiver mode button 

(5)

 and the

Bluetooth

® button 

(9)

 at the same time for at least 3 s. The

indicator 

CAL guard

(3)

 will go out.

Should the measuring tool exceed the maximum deviation
during one of the tests, please have it repaired by a 

Bosch

after-sales service.

Accuracy Check of the Measuring Tool

Influences on Accuracy

The largest influence is exerted by the ambient temperature.
In particular, temperature differences that occur from the
ground upwards can refract the laser beam.
In order to minimise thermal influences resulting from heat
rising from the floor, it is recommended that you use the
measuring tool on a tripod. In addition, position the measur-
ing tool in the centre of the work surface, wherever this is
possible.
In addition to external influences, device-specific influences
(e.g. falls or heavy impacts) can also lead to deviations. For
this reason, check the levelling accuracy each time before
beginning work.
First check the levelling accuracy of the horizontal laser line,
then the levelling accuracy of the vertical laser lines.
Should the measuring tool exceed the maximum deviation
during one of the tests, please have it repaired by a 

Bosch

after-sales service.

Checking the Horizontal Levelling Accuracy of the
Transverse Axis

For this check, you will need a free measuring distance of

5

 m on firm ground between two walls (designated A and B).

– Mount the measuring tool close to wall A on a tripod, or

place it on a firm, flat surface. Switch on the measuring
tool in the mode with automatic levelling. Select the oper-
ating mode for generating a horizontal laser plane and a
vertical laser plane directly in front of the measuring tool.

A

B

5 m

– Aim the laser at the closer wall A and allow the measuring

tool to level in. Mark the middle of the point at which the
laser lines cross on the wall (point I).

A

B

180°

– Turn the measuring tool 180°, allow it to level in and mark

the point where the laser lines cross on the opposite wall
B (point 

Ⅱ

).

– Position the measuring tool – without rotating it – close to

wall B, switch it on and allow it to level in.

A

B

– Align the height of the measuring tool (using the tripod or

by placing objects underneath as required) so that the
point where the laser lines cross exactly hits the previ-
ously marked point 

Ⅱ

 on wall B.

Bosch Power Tools

1 609 92A 7GY | (21.04.2022)